Ananova:

The Rolling Stones have a heart machine reportedly backstage in case one collapses on their US tour.

Organisers have brought in a defibrillator, used to shock the heart back into a normal rhythm.

According to The Sun quoting US magazine Globe a source said: "With all four band members now veterans, their managers are not taking any chances."

A spokesman for the band said: "I've never seen a defibrillator backstage."